Triethyl phosphite → HCID 21667292, compound

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Reaction Steps

The starting material is manufactured as follows: 5-Methyl-5-vinyl-2-oxazoline-4-carboxylic acid ethyl ester, b.p. 65°-75° (13 Pa) is obtained by reaction of isocyanoacetic acid ethyl ester with methyl vinyl ketone in a manner analogous to that described in Example 30. By hydrolysis of the 5-methyl-5-vinyl-2-oxazoline-4-carboxylic acid ethyl ester in a manner analogous to that described in Example 1, 2-formylamino-3-hydroxy-3-methyl-4-pentenoic acid ethyl ester is obtained.Reaction of the 2-formylamino-3-hydroxy-3-methyl-4-pentenoic acid ethyl ester with thionyl bromide and subsequent treatment with triethyl phosphite in a manner analogous to that described in Example 1 yields E-2-formylamino-3-methyl-5-diethylphosphono-3-pentenoic acid ethyl ester in the form of a colourless liquid.

Provenance & Evidence